Deprecate target action support.

text/0000-deprecate-target-action-support.md

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+---
+stage: accepted
+start-date: # In format YYYY-MM-DDT00:00:00.000Z
+release-date: # In format YYYY-MM-DDT00:00:00.000Z
+release-versions:
+teams: # delete teams that aren't relevant
+  - cli
+  - data
+  - framework
+  - learning
+  - steering
+  - typescript
+prs:
+  accepted: # Fill this in with the URL for the Proposal RFC PR
+project-link:
+suite: 
+---
+
+<!--- 
+Directions for above: 
+
+stage: Leave as is
+start-date: Fill in with today's date, 2032-12-01T00:00:00.000Z
+release-date: Leave as is
+release-versions: Leave as is
+teams: Include only the [team(s)](README.md#relevant-teams) for which this RFC applies
+prs:
+  accepted: Fill this in with the URL for the Proposal RFC PR
+project-link: Leave as is
+suite: Leave as is
+-->
+
+<-- Replace "RFC title" with the title of your RFC -->
+# Deprecate target action support
+
+## Summary
+
+Deprecate `send` and the corresponding target action support.
+
+## Motivation
+
+These are super-old patterns that nobody needs to use in new code. We've already deprecated the `{{action}}` modifier/helper, which was the primary way to interact with this system.
+
+## Detailed design
+
+Things this would target
+
+- `TargetActionSupport` mixin
+  - `triggerAction`
+- `ActionHandler` mixin
+  - `send` method
+- `ActionSupport` mixin
+  - `send` method
+
+> This is the bulk of the RFC.
+
+> Explain the design in enough detail for somebody
+familiar with the framework to understand, and for somebody familiar with the
+implementation to implement. This should get into specifics and corner-cases,
+and include examples of how the feature is used. Any new terminology should be
+defined here. 
+
+> Please keep in mind any implications within the Ember ecosystem, such as:
+> - Lint rules (ember-template-lint, eslint-plugin-ember) that should be added, modified or removed
+> - Features that are replaced or made obsolete by this feature and should eventually be deprecated
+> - Ember Inspector and debuggability
+> - Server-side Rendering
+> - Ember Engines
+> - The Addon Ecosystem
+> - IDE Support
+> - Blueprints that should be added or modified
+
+## How we teach this
+
+> What names and terminology work best for these concepts and why? How is this
+idea best presented? As a continuation of existing Ember patterns, or as a
+wholly new one?
+
+> Would the acceptance of this proposal mean the Ember guides must be
+re-organized or altered? Does it change how Ember is taught to new users
+at any level?
+
+> How should this feature be introduced and taught to existing Ember
+users?
+
+> Keep in mind the variety of learning materials: API docs, guides, blog posts, tutorials, etc.
+
+## Drawbacks
+
+> Why should we *not* do this? Please consider the impact on teaching Ember,
+on the integration of this feature with other existing and planned features,
+on the impact of the API churn on existing apps, etc.
+
+> There are tradeoffs to choosing any path, please attempt to identify them here.
+
+## Alternatives
+
+> What other designs have been considered? What is the impact of not doing this?
+
+> This section could also include prior art, that is, how other frameworks in the same domain have solved this problem.
+
+## Unresolved questions
+
+> Optional, but suggested for first drafts. What parts of the design are still
+TBD?